KEYWORDS: Signal detection, Sensors, Quartz, Fiber optics sensors, Acoustics, Fiber optics, Frequency response, Signal to noise ratio, Signal processing, Film thickness
This article reported a fiber optic acoustic sensor (FOAS) used for measuring snoring signals. The fabricated sensor consists of a single-mode fiber collimator and a gold-plated quartz film. Based on the incident-angle sensing mechanism, the sensor gets rid of the stringent control of the operating wavelength and cavity length, which greatly reduce the difficulty and cost of equipment manufacturing. Experimental results show that the fabricated sensor has a sensitivity of -145.3dB (re V/µPa @5KHz) and a minimum detectable sound pressure (MDP) of 14.0µPa/Hz1/2 @ 5KHz. The prepared sensor has the advantages of simple structure, low cost, compactness, and high sensitivity, which can be used for real-time monitoring of snoring signals.
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